furryrabbit
Fishaholic
Im going to purchase some neon or perhaps cardinal tetras. could anyone tell me if they breed in a tank - and how? 

With difficulty, they need to be conditioned and the water needs to be just right, soft and acid, and the parents removed after spawning and the tank darkened for the eggs to hatch. Nothing that's going to happen in your community tank in other words.
siamese fighters are good breeders but die easy